Yamaha Marching Tuba Screws

[TubaPresident]

So my high school's marching band uses Yamaha Marching Tuba's. The lead-pipe screws are starting to break and I have searched for a while now to find the exact screws for the lead-pipes since we already broke two of them last year and since I start my marching season again tomorrow, I would like to know if anyone knows where I could find some at. The link to the tuba's we use is http://usa.yamaha.com/products/musical- ... mode=model" target="_blank

I would greatly appreciate it.